Vehicle emergency power supply method and system, electronic equipment and medium

Abstract

The embodiment of the invention provides a vehicle emergency power supply method and system, electronic equipment and a medium, and the method comprises the steps: directly extracting in a power battery pack to form at least two groups of extraction single body sections which are electrically isolated from a main power supply loop, and enabling the extraction single body sections to serve as emergency power supply carriers, and an isolation DC / DC device and a small lithium battery in a conventional scheme do not need to be additionally configured; and the BOM (Bill of Material) expenditure of the high-cost component is saved from the source. According to the specific execution logic, after an emergency power supply request is responded, the current state parameters of each extraction single body section are firstly obtained, a first extraction single body section is screened out, then the first extraction single body section is connected to a standby power supply bus, an emergency power supply rule is verified through voltage parameters within a preset duration, and finally a power supply task is executed. The whole process does not depend on a long-term floating charge standby mode of a traditional standby battery, the extraction monomer section is electrically isolated from a main power supply loop in a normal state, floating charge voltage does not need to be maintained, and the problems of accelerated attenuation of battery capacity and shortened service life caused by a floating charge state are avoided.

Description

Technical Field

[0001] This application relates to the field of drive-by-wire chassis technology, and in particular to a vehicle emergency power supply method, system, electronic device and medium. Background Technology

[0002] In current drive-by-wire chassis technology, to ensure the system retains steering capability even in the event of a power outage, a dual-path low-voltage power supply architecture is typically employed. This architecture includes a primary power supply and a backup power supply. The primary 12V power supply relies on lead-acid or lithium iron phosphate batteries, while the backup 12V power supply consists of an isolated DC / DC inverter or a small backup battery. The architecture requires that in the event of a primary power failure, the backup 12V power supply must seamlessly take over within seconds to ensure the continued operation of critical actuators such as the steering motor and brake pump, allowing the driver to safely decelerate or leave dangerous areas. However, this architecture suffers from a high BOM (Bill of Materials) cost due to the combination of an isolated DC / DC inverter and a small lithium battery, and the long-term float charge voltage state of the backup battery accelerates battery capacity degradation and shortens battery life. Summary of the Invention

[0003] In view of the above problems, in order to reduce the BOM cost of the power supply architecture in the drive-by-wire chassis system and to address the problem of easy degradation of battery life in its power supply architecture, this application provides a vehicle emergency power supply method, system, electronic device and medium.

[0004] The embodiments of this application disclose the following technical solutions: In a first aspect, embodiments of this application provide a vehicle emergency power supply method, applied to a vehicle, the vehicle including a power battery pack, the power battery pack including at least two sets of extractable cell sections electrically isolated from the main power supply circuit, and the extractable cell sections being formed by extraction from the power battery pack; the method includes: In response to an emergency power supply request, the current status parameters of each extracted unit segment are obtained; Based on the current status parameters of the extracted individual segments in each group, individual segments are filtered, and a first extracted individual segment for performing the emergency power supply task is determined from the extracted individual segments in each group; the emergency power supply task corresponds to the emergency power supply request. The first extracted unit segment is connected to the backup power supply bus, and the voltage parameters of the backup power supply bus within a preset time after the first extracted unit segment is connected are used to determine whether the first extracted unit segment meets the emergency power supply rules. If it is determined that the first extracted unit segment meets the emergency power supply rules, the emergency power supply task is executed through the first extracted unit segment.

[0005] In one possible implementation, the voltage parameters include bus voltage and voltage ripple amplitude; the emergency power supply rules include a first rule and a second rule. The first rule includes: Within the preset time period after the first extraction unit segment is connected to the backup power supply bus, it is determined whether the bus voltage is not less than the first voltage threshold. The second rule includes: Within the preset time period after the first extracted unit segment is connected to the backup power supply bus, it is determined whether the voltage ripple amplitude is not greater than the ripple threshold. The step of determining whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time period after being connected to the first extracted unit segment includes: If both the first rule and the second rule are satisfied, it is determined that the first extraction unit segment satisfies the emergency power supply rule; If either the first rule or the second rule is not met, it is determined that the first extraction unit segment does not meet the emergency power supply rule.

[0006] In one possible implementation, the power battery pack includes a bidirectional synchronous buck-boost module, which is connected through relays corresponding to each of the extracted cell segments, and each of the extracted cell segments has a uniform supercapacitor cluster. The step of connecting the first extracted unit segment to the backup power supply bus includes: The supercapacitor cluster is pre-charged to the target voltage using the bidirectional synchronous buck-boost module. The supercapacitor cluster pre-charged to the target voltage and the bidirectional synchronous buck-boost module are connected to the backup power supply bus, thus completing the connection of the first extracted unit segment to the backup power supply bus.

[0007] In one possible implementation, the current state parameters include insulation value, current temperature, and current state of charge (SOC); the current SOC is the current state of charge. The step of filtering individual segments based on the current state parameters of each group of extracted individual segments, and determining the first extracted individual segment from each group of extracted individual segments to perform the emergency power supply task, includes: A status assessment is performed based on the insulation value, current temperature, and current SOC of each extracted unit segment to determine the power supply capability score of each extracted unit segment. The extraction unit segment with the highest power supply capability score among all extraction unit segments is determined as the first extraction unit segment.

[0008] In one possible implementation, after the emergency power supply task is performed through the first extracted unit segment, the method further includes: During the execution of the emergency power supply task, the bus voltage of the main power supply circuit is acquired in real time; If the bus voltage of the main power supply circuit is not less than the second voltage threshold, and the duration of the main power supply circuit above the second voltage threshold is not less than the preset duration threshold, trickle charging is performed on the first extracted cell segment through the cell segments in the power battery pack, excluding each extracted cell segment. After indicating that the first extraction unit segment has been fully charged, disconnect the connection between the first extraction unit segment and the backup power supply bus.

[0009] In one possible implementation, after determining whether the first extracted unit segment meets the emergency power supply rules, the method further includes: If it is determined that the first extracted unit segment does not meet the emergency power supply rules, the connection between the first extracted unit segment and the backup power supply bus is cut off, and an abnormal alarm signal is generated.

[0010] In one possible implementation, the method further includes: Obtain the rotation trigger index for each of the extracted individual segments; the rotation trigger index includes at least one of the number of charging cycles and the driving mileage of the extracted segment; The battery cell lifespan of each extracted cell segment is calculated based on the rotation trigger index of each extracted cell segment to obtain a rotation cell group; the rotation cell group includes a second extracted cell segment and a third extracted cell segment, and the absolute value of the difference in battery cell lifespan between the second extracted cell segment and the third extracted cell segment is not less than the lifespan difference threshold. The second extracted unit segment and the third extracted unit segment are called in rotation.

[0011] Secondly, embodiments of this application provide a vehicle emergency power supply system applied to a vehicle, the vehicle including a power battery pack, the power battery pack including at least two sets of extractable cell sections electrically isolated from the main power supply circuit, and the extractable cell sections are formed by extraction from the power battery pack; the system includes: The acquisition module is used to acquire the current status parameters of each of the extracted individual segments in response to an emergency power supply request; The filtering module is used to filter individual segments according to the current status parameters of each group of extracted individual segments, and determine the first extracted individual segment to perform the emergency power supply task from each group of extracted individual segments; the emergency power supply task corresponds to the emergency power supply request; The circuit access module is used to connect the first extracted unit segment to the backup power supply bus, and determine whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time after the first extracted unit segment is connected. The power supply module is used to perform the emergency power supply task through the first extracted unit segment when it is determined that the first extracted unit segment meets the emergency power supply rules.

[0012] Thirdly, embodiments of this application provide an electronic device, the device including: a processor, a memory, and a system bus; The processor and the memory are connected via the system bus; The memory is used to store one or more programs, the one or more programs including instructions that, when executed by the processor, cause the processor to perform any of the possible vehicle emergency power supply methods in the first aspect.

[0013] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the possible vehicle emergency power supply methods in the first aspect.

[0014] Compared with the prior art, this application has the following beneficial effects: The embodiments of this application provide a vehicle emergency power supply method, system, electronic device and medium. This method directly extracts at least two sets of extracted single-cell segments that are electrically isolated from the main power supply circuit from the power battery pack as carriers for emergency power supply. There is no need to configure the isolation DC / DC device and small lithium battery in the traditional solution. This eliminates the BOM expenditure of such high-cost components from the root and effectively solves the technical problem of high cost caused by the combination of isolation DC / DC device and small lithium battery in the traditional redundant power supply solution. In terms of specific execution logic, after responding to an emergency power supply request, the current status parameters of each extracted cell segment are first obtained and the first extracted cell segment is selected. Then, it is connected to the backup power supply bus and the emergency power supply rules are verified by the voltage parameters within a preset time period. Finally, the power supply task is executed. The entire process does not rely on the long-term float charging standby mode of traditional backup batteries. The extracted cell segment is electrically isolated from the main power supply circuit under normal conditions and does not need to maintain the float charging voltage. This avoids the problem of accelerated battery capacity decay and shortened service life caused by the float charging state. The reliability of emergency power supply is ensured by the status parameter acquisition and voltage parameter verification steps. At the same time, it saves the additional energy consumption and maintenance costs associated with traditional backup batteries. Without reducing the safety and effectiveness of emergency power supply, it achieves dual optimization of cost control and service life improvement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A flowchart illustrating a vehicle emergency power supply method provided in an embodiment of this application; Figure 2 This application provides a schematic diagram of the structure of a vehicle emergency power supply system according to an embodiment of the present application. Figure 3 This is a schematic diagram of another vehicle emergency power supply system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a vehicle emergency power supply electronic device provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be particularly noted that the embodiments described in this application are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] As described earlier, current drive-by-wire chassis technology typically employs a dual-path low-voltage power supply architecture to ensure steering capability even in the event of a power outage. This architecture includes a primary power supply and a backup power supply. The primary 12V power supply relies on lead-acid or lithium iron phosphate batteries, while the backup 12V power supply consists of an isolated DC / DC inverter or a small backup battery. The architecture requires that in the event of a primary power failure, the backup 12V power supply must seamlessly take over within seconds to ensure the continued operation of critical actuators such as the steering motor and brake pump, allowing the driver to safely decelerate or leave dangerous areas. However, this architecture suffers from high BOM costs due to the combination of an isolated DC / DC inverter and a small lithium battery, and the long-term float charge voltage state of the backup battery accelerates battery capacity degradation and shortens battery life.

[0020] Based on this, embodiments of this application provide a vehicle emergency power supply method, system, electronic device, and medium. This method directly extracts at least two sets of extracted single-cell segments electrically isolated from the main power supply circuit from the power battery pack as carriers for emergency power supply. It eliminates the need for additional configuration of isolated DC / DC devices and small lithium batteries in traditional solutions, thereby fundamentally saving the BOM expenditure of such high-cost components and effectively solving the technical problem of high cost caused by the combination of isolated DC / DC devices and small lithium batteries in traditional redundant power supply solutions. In terms of specific execution logic, after responding to an emergency power supply request, the current status parameters of each extracted cell segment are first obtained and the first extracted cell segment is selected. Then, it is connected to the backup power supply bus and the emergency power supply rules are verified by the voltage parameters within a preset time period. Finally, the power supply task is executed. The entire process does not rely on the long-term float charging standby mode of traditional backup batteries. The extracted cell segment is electrically isolated from the main power supply circuit under normal conditions and does not need to maintain the float charging voltage. This avoids the problem of accelerated battery capacity decay and shortened service life caused by the float charging state. The reliability of emergency power supply is ensured by the status parameter acquisition and voltage parameter verification steps. At the same time, it saves the additional energy consumption and maintenance costs associated with traditional backup batteries. Without reducing the safety and effectiveness of emergency power supply, it achieves dual optimization of cost control and service life improvement.

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] It should be noted beforehand that in this embodiment, the vehicle's core power source and emergency power supply rely on the same power battery pack. This power battery pack, while meeting the high-voltage power supply requirements for vehicle operation, also internally reserves at least two sets of extractable cell sections. Each set of extractable cell sections is electrically isolated from the main power supply circuit via a dedicated solid-state relay, thus avoiding mutual interference between the main circuit and the emergency circuit. These extractable cell sections are not additional independent components, but are formed by directly extracting a specific number of cells from the existing cell array of the power battery pack and connecting them in series. For example, for a common 3.6V single cell, each set of extractable cell sections uses a 4S series connection, with an output voltage of approximately 14.4V, perfectly matching the vehicle's 12V low-voltage emergency power supply requirement, eliminating the need for isolated DC / DC converters or additional backup batteries found in traditional solutions. Under normal conditions, the solid-state relays corresponding to the cell sections are in the off state, and the extractable cell sections are completely isolated from the main power supply circuit. This does not affect the normal charging and discharging operation of the main circuit and allows the extractable cell sections to remain in a stable standby state, avoiding unnecessary energy consumption and lifespan loss. On the other hand, the design of at least two groups of individual cell segments provides redundancy for emergency power supply. When any of the individual cell segments is unsuitable for power supply, a corresponding cell segment rotation strategy can be triggered, thereby avoiding degradation caused by overuse of a single group of segments. In one possible implementation, mileage or the number of charging cycles can be used as the basis for rotating different cell segments to ensure that the differences in battery cell life (SOH) among multiple groups of extracted cell segments are controlled within a manageable range. Specifically, the process of rotating and calling up each extracted cell segment is achieved through the following three steps: Step 1: Obtain the rotation trigger index for each of the extracted individual segments; the rotation trigger index includes at least one of the number of charging cycles and the driving mileage of the extracted segment.

[0023] In the vehicle emergency low-voltage power supply system of this embodiment, the rotation strategy is a key element in ensuring the long-term stable operation of multiple extracted cell segments. Its goal is to balance the usage losses of each cell segment through rotation logic, ensuring that the differences in battery cell lifespan between different segments remain within a controllable range, and preventing a decrease in redundant power supply capacity due to excessive wear of some cell segments. Therefore, the selection of rotation criteria is crucial. Considering the actual operating scenario of the system and data availability, the number of charging cycles and the driving mileage of the extracted segments were ultimately determined as rotation trigger indicators. Meeting at least one of these indicators is sufficient to initiate a rotation assessment, ensuring both the flexibility of the trigger logic and coverage of the usage loss dimension of the cell segments. The number of charging cycles directly reflects the total number of charge-discharge cycles experienced by a cell segment. Each activation of emergency power supply and energy recharge process forms a complete cycle, and its increase is positively correlated with the decay of the active materials inside the battery. The driving mileage of the extracted segments focuses on the total distance the cell segment actually supports the vehicle's travel, corresponding to its actual load intensity in emergency scenarios. These two indicators complement each other to accurately characterize the wear status of the extracted cell segments.

[0024] Step 2: Calculate the battery cell lifespan of each extracted cell segment based on the rotation trigger index of each extracted cell segment to obtain a rotation cell group; the rotation cell group includes a second extracted cell segment and a third extracted cell segment, and the absolute value of the difference in battery cell lifespan between the second extracted cell segment and the third extracted cell segment is not less than the lifespan difference threshold.

[0025] After obtaining the rotation trigger indicators for each extracted cell segment, it is necessary to select cell groups that meet the rotation conditions. During this process, the cumulative number of cycles and the mileage of the extracted segments are converted into quantifiable lifespan loss values, ultimately calculating the battery cell lifespan for each cell segment. Based on this, rotation cell groups that meet the rotation conditions are selected. Each rotation cell group includes a second and a third extracted cell segment, and the absolute value of the difference in battery cell lifespan between the two segments is not less than a preset lifespan difference threshold. The purpose of setting the lifespan difference threshold is to avoid ineffective rotations and ensure that each rotation effectively reduces the battery lifespan difference between different cell segments. If the lifespan difference between the two cell segments is too small, the rotation operation will not only fail to bring a significant balancing effect but may also generate additional losses due to relay switching and other actions. Therefore, the threshold setting must balance balancing efficiency and system stability. This threshold can be determined based on factors such as battery type and vehicle usage scenarios, ensuring that the difference is significant enough to reflect the value of rotation, while preventing some cell segments from being excessively worn and unable to be rotated due to an excessively high threshold.

[0026] Step 3: Rotate the second extraction unit segment and the third extraction unit segment.

[0027] Finally, the rotation and deployment process is initiated. During the rotation and deployment of the second and third extracted individual cell segments, the current status of both segments is first re-checked to confirm that key parameters such as insulation performance, temperature, and voltage are within normal ranges, preventing electrical faults during the rotation process. Subsequently, the rotation and deployment of the two sets of individual cell segments is achieved by controlling the soft switching action of the solid-state relays. The individual cell segment originally in standby mode will switch to active standby mode, ready to step in and provide power in case of failure of the main low-voltage power supply, while the original active standby segment will switch to standby mode and enter a low-loss sleep mode. In this way, the rotation and deployment of individual cell segments with large differences in battery life can be dynamically balanced to keep the differences in battery life among multiple sets of extracted individual cell segments within a preset range, providing a guarantee for the long-term stable operation of the emergency power supply system and further enhancing the functional safety of the entire low-voltage power supply system.

[0028] See Figure 1 The figure is a schematic flowchart of a vehicle emergency power supply method provided in an embodiment of this application, which specifically includes the following steps: S101: In response to an emergency power supply request, obtain the current status parameters of each of the extracted individual segments.

[0029] In this embodiment, the emergency power supply request is triggered primarily by the BCM (Body Control Module), and its generation depends on voltage detection and fault determination of the main power supply circuit. The BCM continuously collects the voltage of the main power supply circuit throughout the vehicle's operation. When the voltage is detected to be below a set threshold, it determines that a persistent power outage fault has occurred in the main low-voltage power supply, and thus generates an emergency power supply request.

[0030] In response to emergency power supply requests, the system immediately acquires the current status parameters of each extracted cell segment. These parameters encompass multiple dimensions, including the insulation value, current temperature, and current SOC (State of Charge, remaining battery capacity) for each segment. For the insulation value, a built-in insulation monitoring algorithm calculates the insulation resistance of each segment in real time, assessing the electrical isolation between the high-voltage and low-voltage sides. This accurate insulation value acquisition effectively mitigates serious safety hazards such as leakage and short circuits caused by insulation failure. The current temperature is collected using built-in temperature sensors within each segment. This process records not only the overall real-time temperature of each segment but also monitors the temperature difference between individual cells within the segment. Excessive temperature or large temperature differences can lead to decreased battery cell discharge performance and increased risk of thermal runaway. The current SOC is obtained through high-precision voltage sampling combined with algorithmic calculations. This requires collecting the total voltage and individual cell voltage distribution data for all substrings within each segment to calculate the remaining capacity. The SOC value directly reflects the available emergency power supply capacity of the extracted cell segment and is a key indicator for selecting the optimal backup segment.

[0031] S102: Based on the current status parameters of the extracted individual segments in each group, the individual segments are filtered, and a first extracted individual segment for performing the emergency power supply task is determined from the extracted individual segments in each group; the emergency power supply task corresponds to the emergency power supply request.

[0032] After receiving the current status parameters of each extracted unit segment, the unit segments are filtered based on these parameters to ultimately determine the first extracted unit segment used to perform the emergency power supply task. Specifically, the process of determining the first extracted unit segment from multiple groups of extracted unit segments is achieved through the following two steps: Step 1: Based on the insulation value, current temperature, and current SOC of each extracted unit segment, perform a status assessment to determine the power supply capability score of each extracted unit segment.

[0033] Step 2: The extraction unit segment with the highest power supply capability score among all extraction unit segments is determined as the first extraction unit segment.

[0034] During the initial selection of individual units, the power supply capability of each unit is evaluated based on three parameters: insulation value, current temperature, and current state of charge (SOC). This evaluation is presented as a power supply capability score. Each parameter has its own scoring rules. For insulation value, the evaluation uses a preset safety threshold as the baseline. For example, the insulation value must be greater than 600kΩ. Higher insulation resistance indicates better electrical isolation between the high-voltage and low-voltage sides, lower safety risk, and a higher power supply capability score in the insulation value dimension. If the insulation value is below the threshold, the unit is deemed unqualified for power supply, and its power supply capability score in the insulation value dimension is zero, immediately excluding it from subsequent selection. The current temperature evaluation considers both the overall temperature and the temperature difference within the group. A higher score is obtained when the temperature is within the optimal operating range of approximately 31℃ with a small temperature difference. If the temperature exceeds the safety limit or shows an abnormal temperature rise trend, the score will be deducted proportionally according to the degree of exceedance to avoid affecting the stability of emergency power supply due to thermal runaway risk. Currently, State of Charge (SOC) is a core indicator determining emergency power supply range, and it carries a relatively higher weight in the scoring system. A higher SOC value indicates more available power, allowing for longer continuous operation of key actuators such as steer-by-wire and brake-by-wire, resulting in a higher score. These three dimensions of parameters work together in the calculation to ensure that the selected individual segments can provide sufficient emergency power to the vehicle while ensuring safety.

[0035] In one possible implementation, the power supply capacity score can be determined by weighting the scores of the three parameters in their respective dimensions. The weights of these parameters can be dynamically adjusted based on the vehicle's driving scenario. For example, in scenarios with extremely high requirements for power supply stability, such as high-speed driving, the weight of insulation and temperature parameters will be appropriately increased to prioritize the safety of the power supply link. Conversely, in scenarios requiring long-distance emergency driving range, the weight of the current State of Charge (SOC) will be increased to ensure sufficient power supply.

[0036] After the power supply capacity scores of all individual segments are calculated, the scores are ranked, and the individual segment with the highest power supply capacity score is selected as the first individual segment to perform this emergency power supply task. This ensures both the safety and stability of emergency power supply and maximizes the emergency power supply efficiency of the power battery pack. In one possible implementation, if two or more groups of individual segments have the same score in an extreme case, the fluctuation trends of the real-time parameters of each group are further compared, and the individual segment with more stable parameters and no potential abnormal risks is selected first to ensure the safety and stability of the power supply process.

[0037] S103: Connect the first extracted unit segment to the backup power supply bus, and determine whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time after being connected to the first extracted unit segment.

[0038] Once the first isolated unit segment is identified, the connection process begins immediately. This involves establishing a connection between the first isolated unit segment and the backup power bus. The core operation involves controlling the closing of the solid-state relay corresponding to the first isolated unit segment, thus forming a complete power supply link between this unit segment and the bidirectional synchronous buck-boost module and supercapacitor cluster located within the power battery pack. After connection, the voltage parameters of the backup power bus are continuously collected within a preset time period, with a focus on monitoring two key indicators: bus voltage and voltage ripple amplitude. This is to determine whether the first isolated unit segment can meet the emergency power supply rules during actual power supply. The emergency power supply rules measure the voltage stability of the first isolated unit segment during power supply and whether the voltage meets the standards. The emergency power supply rules include a first rule and a second rule, which correspond to the requirements for voltage compliance and stability, respectively. The first rule specifies that within a preset time period after the first isolated unit segment is connected to the backup power bus, the bus voltage must reach at least a first voltage threshold. This threshold is set based on the minimum operating voltage requirements of key actuators such as drive-by-wire steering and brake-by-wire, ensuring that the actuators receive sufficient power support. The second rule requires that the voltage ripple amplitude not exceed the ripple threshold. Excessive ripple may cause signal interference in electronic devices, accelerated wear of components, and even malfunction of control logic. Therefore, this rule is crucial to ensuring power supply quality.

[0039] In determining whether the first extracted unit segment meets the emergency power supply rules, it can only be deemed compliant if both the first and second rules are simultaneously met. This allows the unit to enter the stable backup power supply operation phase, at which point the vehicle controller activates a "degraded driving mode," and the instrument panel alerts the driver to take safe evasive action. If either rule is not met, the first extracted unit segment is immediately deemed non-compliant with the emergency power supply rules, and the corresponding solid-state relay is quickly disconnected to prevent damage to the busbar and downstream equipment from substandard power supply. An alarm mechanism is also triggered to alert the driver. This precise monitoring and determination ensures the reliability of emergency power supply and allows for timely mitigation of losses in the event of power supply anomalies, minimizing driving risks.

[0040] As described in the preceding section on the process of connecting the first extracted unit segment to the backup power supply bus, this embodiment forms a complete power supply link between the first extracted unit segment and the backup power supply bus through a bidirectional synchronous step-up / step-down module and a supercapacitor cluster. Next, the method of connecting the first extracted unit segment to the backup power supply bus will be described in conjunction with the accompanying drawings of the specific embodiment.

[0041] Specifically, the process of connecting the first extracted unit section to the backup power supply bus is achieved through the following two steps: Step 1: Precharge the supercapacitor cluster to the target voltage using the bidirectional synchronous buck-boost module; Step 2: Connect the supercapacitor cluster pre-charged to the target voltage and the bidirectional synchronous buck-boost module to the backup power supply bus, thus completing the connection of the first extracted unit segment to the backup power supply bus.

[0042] See Figure 2 The figure is a schematic diagram of the structure of a vehicle emergency power supply system provided in an embodiment of this application. In the figure, group A and group B correspond to the extraction unit section in the embodiment of this application, Buck-Boost corresponds to the bidirectional synchronous buck-boost module set in the power battery pack in the embodiment of this application, the main low-voltage circuit corresponds to the backup power supply bus, and the switching control module is used to control the working mode of Buck-Boost to realize the switching between high and low voltage.

[0043] During the process of connecting the first extracted unit section to the backup power supply bus, the coordinated operation of the bidirectional synchronous buck-boost module and the supercapacitor cluster is relied upon. Figure 2 In the architecture, the two sets of pre-reserved extractable cell sections (A / B) within the power battery pack are individually connected to the bidirectional synchronous buck-boost module via their corresponding solid-state relays (K1 / K2). The supercapacitor cluster, serving as a low-voltage buffer energy storage component uniformly adapted to all extractable cell sections, is directly connected in series between the module and the backup power supply bus. When the first extractable cell section (e.g., group A) is selected, the corresponding solid-state relay K1 is immediately closed, connecting the cell section to the bidirectional synchronous buck-boost module. The switching control module then controls the Buck-Boost to switch to Buck mode, utilizing its efficient conversion capability of a single-inductor four-MOS synchronous topology to pre-charge the supercapacitor cluster with a constant current, thereby locking the voltage of the supercapacitor cluster at the target voltage.

[0044] Once the voltage of the supercapacitor cluster reaches the target voltage, the bidirectional synchronous buck-boost module will synchronously connect to the backup power supply bus with the pre-charged supercapacitor cluster, establishing a complete power supply loop from the first extracted unit section to the bus, thus completing the connection process. Upon connection, Buck-Boost immediately switches to voltage regulation mode, working in conjunction with the supercapacitor cluster to quickly adjust the bus voltage. This fully utilizes the instantaneous energy storage and voltage regulation characteristics of the supercapacitor cluster while the precise control of the bidirectional synchronous buck-boost module avoids electrical interference during connection, ensuring the power stability of various critical actuators connected to the backup power supply bus.

[0045] S104: If it is determined that the first extraction unit segment meets the emergency power supply rules, the emergency power supply task is executed through the first extraction unit segment.

[0046] When the first extraction unit is determined to meet the emergency power supply rules, it will perform the emergency power supply task. At this time, the first extraction unit, through the coordinated operation of the bidirectional synchronous buck-boost module and the supercapacitor cluster, continuously provides stable power to the backup power bus, ensuring that the bus voltage remains within the set safe low-voltage range and that critical actuators inside the vehicle can continue to operate. In this situation, the vehicle controller will simultaneously enter a degraded driving mode, the instrument panel will illuminate a fault indicator light, and the driver will be informed that the main power supply has failed and that the vehicle must be driven away from the danger zone and brought to a safe stop as soon as possible.

[0047] S105: If it is determined that the first extraction unit segment does not meet the emergency power supply rules, disconnect the connection between the first extraction unit segment and the backup power supply bus and generate an abnormal alarm signal.

[0048] If the first extracted unit segment is detected to have failed to meet emergency power supply requirements, a command will be quickly issued to disconnect the corresponding solid-state relay, severing the electrical connection between the first extracted unit segment and the backup power supply bus. This prevents voltage surges or equipment damage to the bus and downstream actuators caused by substandard power supply. Simultaneously, an abnormal alarm signal will be generated, illuminating the fault warning light on the instrument panel and possibly accompanied by an audible alert. This allows the driver to be promptly informed of the emergency power supply failure and to take emergency evasive action, thereby ensuring driving safety.

[0049] In particular, in one possible implementation, during the emergency power supply task performed by the first extracted unit segment, the voltage of the main power supply circuit can be continuously monitored to ensure it has stabilized. If stabilization is confirmed, the first extracted unit segment can be trickle-charged again to prevent excessive differences in energy reserves between the extracted unit segments. This can be achieved through the following three steps: Step 1: During the execution of the emergency power supply task, the bus voltage of the main power supply circuit is acquired in real time.

[0050] During the initial emergency power supply operation in the selected unit section, the bus voltage of the main power supply circuit was continuously monitored to ensure it stabilized. Throughout the monitoring process, the emergency power supply continued to provide stable power to critical actuators, ensuring the driver could continue to maneuver the vehicle towards a safe area.

[0051] Step 2: If the bus voltage of the main power supply circuit is not less than the second voltage threshold, and the duration of the main power supply circuit above the second voltage threshold is not less than the preset duration threshold, trickle charge is performed on the first extracted cell segment through the cell segments in the power battery pack, excluding each extracted cell segment.

[0052] Once the bus voltage of the main power supply circuit is detected to be no less than the second voltage threshold, and this state is maintained stably for no less than a preset duration threshold, it is determined that the main power supply and the main power supply circuit have been restored, and the trickle charging process for the first extracted cell segment is initiated. The charging power is directly drawn from other normal cell segments in the power battery pack, excluding the extracted cell segments, and energy is transferred by switching to Boost mode through the previously designed bidirectional synchronous buck-boost module to replenish the first extracted cell segment. The purpose of this charging process is to balance the SOC of the first extracted cell segment, preventing it from becoming unbalanced with the other cell segments in the power battery pack due to emergency discharge, ensuring the consistency of the cells in the entire power battery pack, preventing excessive SOC differences between cells, and also preparing the first extracted cell segment to serve as a backup power source again in the future, avoiding capacity decay or performance degradation due to a single discharge.

[0053] Step 3: After indicating that the first extraction unit segment has been fully charged, disconnect the connection between the first extraction unit segment and the backup power supply bus.

[0054] Accordingly, once the SOC of the first extracted cell segment has recovered to a level basically consistent with the overall power battery pack level, and the charging time has reached the preset standard, the charging is deemed complete, and the disconnection process between the first extracted cell segment and the backup power supply bus is initiated. To avoid sudden current surges or relay arcing during disconnection, a soft-switching method can be used to control the corresponding solid-state relay to disconnect, ensuring a smooth and shock-free disconnection process while preventing voltage fluctuations from damaging the backup power supply bus and related circuits. After the disconnection action is completed, the first extracted cell segment regains electrical isolation from the main power supply circuit, and the backup power supply system officially exits the emergency working state and returns to the normal standby monitoring mode. At the same time, the VCU simultaneously exits the degraded driving mode, the fault indicator lights on the instrument panel are automatically cleared, and the vehicle returns to the normal state of being powered by the main power supply circuit.

[0055] This application provides a vehicle emergency power supply method. This method uses at least two sets of extracted single-cell segments that are electrically isolated from the main power supply circuit directly extracted from the power battery pack as carriers for emergency power supply. It eliminates the need for additional configuration of isolated DC / DC devices and small lithium batteries in traditional solutions, thereby saving the BOM expenditure of such high-cost components from the source. It effectively solves the technical problem of high cost caused by the combination of isolated DC / DC devices and small lithium batteries in traditional redundant power supply solutions. In terms of specific execution logic, after responding to an emergency power supply request, the current status parameters of each extracted cell segment are first obtained and the first extracted cell segment is selected. Then, it is connected to the backup power supply bus and the emergency power supply rules are verified by the voltage parameters within a preset time period. Finally, the power supply task is executed. The entire process does not rely on the long-term float charging standby mode of traditional backup batteries. The extracted cell segment is electrically isolated from the main power supply circuit under normal conditions and does not need to maintain the float charging voltage. This avoids the problem of accelerated battery capacity decay and shortened service life caused by the float charging state. The reliability of emergency power supply is ensured by the status parameter acquisition and voltage parameter verification steps. At the same time, it saves the additional energy consumption and maintenance costs associated with traditional backup batteries. Without reducing the safety and effectiveness of emergency power supply, it achieves dual optimization of cost control and service life improvement.

[0056] The following describes a vehicle emergency power supply system provided by an embodiment of this application. The vehicle emergency power supply system described below can be referred to in correspondence with the vehicle emergency power supply method described above.

[0057] See Figure 3 The figure is a schematic diagram of another vehicle emergency power supply system provided in an embodiment of this application, which specifically includes the following modules: The acquisition module 100 is used to acquire the current status parameters of each of the extracted unit segments in response to an emergency power supply request. The filtering module 200 is used to filter individual segments according to the current status parameters of each group of extracted individual segments, and determine the first extracted individual segment to perform the emergency power supply task from each group of extracted individual segments; the emergency power supply task corresponds to the emergency power supply request; The circuit access module 300 is used to connect the first extracted unit segment to the backup power supply bus, and determine whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time after the first extracted unit segment is connected. The power supply module 400 is used to perform the emergency power supply task through the first extracted unit segment when it is determined that the first extracted unit segment meets the emergency power supply rules.

[0058] See Figure 4The figure is a schematic diagram of the structure of a vehicle emergency power supply electronic device provided in an embodiment of this application, including: Memory 11 is used to store computer programs; The processor 12 is used to implement the steps of the vehicle emergency power supply method described in any of the above method embodiments when executing the computer program.

[0059] In this embodiment, the device can be an in-vehicle computer, a PC (Personal Computer), or a terminal device such as a smartphone, tablet computer, handheld computer, or portable computer.

[0060] The device may include a memory 11, a processor 12, and a bus 13.

[0061] The memory 11 includes at least one type of readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of the device, such as the hard disk of the device. In other embodiments, the memory 11 can also be an external storage device of the device, such as a plug-in hard disk, SmartMedia Card (SMC), Secure Digital (SD) card, Flash Card, etc. Furthermore, the memory 11 can include both internal and external storage units of the device. The memory 11 can be used not only to store application software and various types of data installed on the device, such as program code executing vehicle emergency power supply methods, but also to temporarily store data that has been output or will be output. In some embodiments, the processor 12 can be a central processing unit (CPU).

[0062] In some embodiments, processor 12 may be a central processing unit (CPU), controller, microcontroller, microprocessor or other data processing chip, used to run program code stored in memory 11 or process data, such as program code for executing a fault prediction method.

[0063] This bus 13 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0064] Furthermore, the device may also include a network interface 14, which may optionally include a wired interface and / or a wireless interface (such as a Wi-Fi interface, a Bluetooth interface, etc.), typically used to establish communication connections between the device and other electronic devices.

[0065] Optionally, the device may further include a user interface 15, which may include a display, an input unit such as a keyboard, and optionally, a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen, etc. The display may also be appropriately referred to as a screen or display unit, used to display information processed in the device and to display a visual user interface.

[0066] Figure 4 Only devices with components 11-15 are shown; those skilled in the art will understand that... Figure 4 The structure shown does not constitute a limitation on the device and may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0067] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a computer-readable storage medium storing computer instructions for causing the computer to execute the vehicle emergency power supply method as described in any of the above embodiments.

[0068] The computer-readable media in this application embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0069] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the vehicle emergency power supply method for millimeter wave signals as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0070] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for methods, systems, electronic devices, and media, since they are basically similar to the method embodiments, the descriptions are relatively simple, and relevant parts can be referred to the descriptions of the method embodiments. The methods, systems, electronic devices, and media described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0071] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for providing emergency power to a vehicle, characterized in that, Applied to a vehicle, the vehicle including a power battery pack, the power battery pack including at least two sets of extractable cell sections electrically isolated from the main power supply circuit, and the extractable cell sections being formed by extracting cells from the power battery pack; the method includes: In response to an emergency power supply request, the current status parameters of each extracted unit segment are obtained; Based on the current status parameters of the extracted individual segments in each group, individual segments are filtered, and a first extracted individual segment for performing the emergency power supply task is determined from the extracted individual segments in each group; the emergency power supply task corresponds to the emergency power supply request. The first extracted unit segment is connected to the backup power supply bus, and the voltage parameters of the backup power supply bus within a preset time after the first extracted unit segment is connected are used to determine whether the first extracted unit segment meets the emergency power supply rules. If it is determined that the first extracted unit segment meets the emergency power supply rules, the emergency power supply task is executed through the first extracted unit segment.

2. The method according to claim 1, characterized in that, The voltage parameters include bus voltage and voltage ripple amplitude; the emergency power supply rules include a first rule and a second rule. The first rule includes: Within the preset time period after the first extraction unit segment is connected to the backup power supply bus, it is determined whether the bus voltage is not less than the first voltage threshold. The second rule includes: Within the preset time period after the first extracted unit segment is connected to the backup power supply bus, it is determined whether the voltage ripple amplitude is not greater than the ripple threshold. The step of determining whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time period after being connected to the first extracted unit segment includes: If both the first rule and the second rule are satisfied, it is determined that the first extraction unit segment satisfies the emergency power supply rule; If either the first rule or the second rule is not met, it is determined that the first extraction unit segment does not meet the emergency power supply rule.

3. The method according to claim 1, characterized in that, The power battery pack includes a bidirectional synchronous buck-boost module, which is connected through a relay corresponding to each of the extracted cell segments, and each of the extracted cell segments has a uniform supercapacitor cluster. The step of connecting the first extracted unit segment to the backup power supply bus includes: The supercapacitor cluster is pre-charged to the target voltage using the bidirectional synchronous buck-boost module. The supercapacitor cluster pre-charged to the target voltage and the bidirectional synchronous buck-boost module are connected to the backup power supply bus, thus completing the connection of the first extracted unit segment to the backup power supply bus.

4. The method according to claim 1, characterized in that, The current state parameters include insulation value, current temperature, and current SOC; the current SOC is the current state of charge. The step of filtering individual segments based on the current state parameters of each group of extracted individual segments, and determining the first extracted individual segment from each group of extracted individual segments to perform the emergency power supply task, includes: A status assessment is performed based on the insulation value, current temperature, and current SOC of each extracted unit segment to determine the power supply capability score of each extracted unit segment. The extraction unit segment with the highest power supply capability score among all extraction unit segments is determined as the first extraction unit segment.

5. The method according to claim 1, characterized in that, After the emergency power supply task is performed through the first extraction unit segment, the method further includes: During the execution of the emergency power supply task, the bus voltage of the main power supply circuit is acquired in real time; If the bus voltage of the main power supply circuit is not less than the second voltage threshold, and the duration of the main power supply circuit above the second voltage threshold is not less than the preset duration threshold, trickle charging is performed on the first extracted cell segment through the cell segments in the power battery pack, excluding each extracted cell segment. After indicating that the first extraction unit segment has been fully charged, disconnect the connection between the first extraction unit segment and the backup power supply bus.

6. The method according to claim 1, characterized in that, After determining whether the first extracted unit segment meets the emergency power supply rules, the method further includes: If it is determined that the first extracted unit segment does not meet the emergency power supply rules, the connection between the first extracted unit segment and the backup power supply bus is cut off, and an abnormal alarm signal is generated.

7. The method according to claim 1, characterized in that, The method further includes: Obtain the rotation trigger index for each of the extracted individual segments; the rotation trigger index includes at least one of the number of charging cycles and the driving mileage of the extracted segment; The battery cell lifespan of each extracted cell segment is calculated based on the rotation trigger index of each extracted cell segment to obtain a rotation cell group; the rotation cell group includes a second extracted cell segment and a third extracted cell segment, and the absolute value of the difference in battery cell lifespan between the second extracted cell segment and the third extracted cell segment is not less than the lifespan difference threshold. The second extracted unit segment and the third extracted unit segment are called in rotation.

8. A vehicle emergency power supply system, characterized in that, Applied to a vehicle, the vehicle including a power battery pack, the power battery pack including at least two sets of extractable cell sections electrically isolated from the main power supply circuit, and the extractable cell sections being formed by extracting cells from the power battery pack; the system includes: The acquisition module is used to acquire the current status parameters of each of the extracted individual segments in response to an emergency power supply request; The filtering module is used to filter individual segments according to the current status parameters of each group of extracted individual segments, and determine the first extracted individual segment to perform the emergency power supply task from each group of extracted individual segments; the emergency power supply task corresponds to the emergency power supply request; The circuit access module is used to connect the first extracted unit segment to the backup power supply bus, and determine whether the first extracted unit segment meets the emergency power supply rules based on the voltage parameters of the backup power supply bus within a preset time after the first extracted unit segment is connected. The power supply module is used to perform the emergency power supply task through the first extracted unit segment when it is determined that the first extracted unit segment meets the emergency power supply rules.

9. An electronic device, characterized in that, The device includes: a processor, a memory, and a system bus; The processor and the memory are connected via the system bus; The memory is used to store one or more programs, the one or more programs including instructions that, when executed by the processor, cause the processor to perform the vehicle emergency power supply method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the vehicle emergency power supply method as described in any one of claims 1-7.

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